US3778908A - Paper machine drying apparatus - Google Patents
Paper machine drying apparatus Download PDFInfo
- Publication number
- US3778908A US3778908A US00166400A US3778908DA US3778908A US 3778908 A US3778908 A US 3778908A US 00166400 A US00166400 A US 00166400A US 3778908D A US3778908D A US 3778908DA US 3778908 A US3778908 A US 3778908A
- Authority
- US
- United States
- Prior art keywords
- felt
- rolls
- drums
- web
- dryer
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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Classifications
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F5/00—Dryer section of machines for making continuous webs of paper
- D21F5/02—Drying on cylinders
Definitions
- Atmrney-Marecha1, Biebel, French & Bugg Filed: July 27, 1971 [57] ABSTRACT
- At least one dryer felt roll in a paper machine dryer section is of the variable crown type so that the pressure with which the roll bears against the dryer felt may be varied along the length of the roll. In this way, nonuniformities in felt tension caused by the deflection of other felt rolls in the dryer section may be compensated for, and more uniform drying of a paper web in the cross machine direction obtained as it is pressed against the dryer drums by the dryer felt.
- an endless felt is usually associated with each set of drums to press the wet web against the surface of the drums.
- the pressure with which the felt presses the wet web against the drum surfaces will determine the rate at which the web is dried. It will also be obvious that if the tension in the dryer felt is nonuniform in the cross machine direction, the pressure with which the wet web is pressed against the drum surfaces will also be nonuniform and result in a nonuniform moisture profile in the web.
- FIG. I is a somewhat schematic view of a dryer section of a paper machine incorporating the present invention.
- FIG. 2 is an elevational view with parts in section showing a variable crown roll which finds utility in the present invention.
- FIG. 3 is a plan view of a portion of the dryer felt showing the efiect on the dryer felt seam of varying tension transversely of the felt.
- a web of paper W is led from the last press of a press section about a pair of rollers 11 and 12, and thence into the dryer section comprising a plurality of additional rollers and referenced in its entirety by the numeral 13.
- the dryer section 13 comprises an upper set and a lower set 30 of large diameter, steamheated drums with the axes of the drums of each set in substantially the same horizontal plane and with the axes of the drums in the lower set offset with respect to the axes of those in the upper set.
- a pair of endless felts 21 and 31 are provided, one for each set of drums in the dryer section.
- the lower run of the upper felt 21 is maintained adjacent a portion of the peripheries of the upper set of drums 20 by means of a series of intermediate felt rolls 22, while lower felt 31 is maintained in position by means of the intermediate felt rolls 32.
- the felts 21 and 31 leave the last drum in their respective sets, they are conveyed by means of turning rolls 23 and 33, respectively, a series of guide and stretch rolls, and lead in rolls 24 and 34, respectively, back into the dryer section.
- the felt rolls are of considerably less diameter than the dryer drums, and hence are more readily subject to deflection as a result of their own weight and the tension in the dryer felt.
- felt return roll 25 would probably tend to sag due to the combined felt weight, its own weight, and the tension in the felt.
- Other felt rolls in the dryer section might tend to deflect in a horizontal plane or even upwardly, depending upon the particular combination of forces acting on them. If the net effect of the deflection of all rolls were to cause greater tension in the felt adjacent the edges thereof than in the center thereof, the felt would tend to press the paper web against the surface of the dryer drum with greater pressure along the edges of, the web than towards the center. This would result in a web having a higher moisture content near its center portion than adjacent its edges. Conversely, if tension adjacent the center of the felt is greater than at the edges, the web would be drier in the center than at its edges as it leaves the dryer section.
- one of the felt rolls preferably the last roll immediately upstream of the dryer section, is provided with means for varying the pressure with which it contacts the felt along the length of the roll.
- dryer section includes not only the series of drums per se, but ancillary equipment such as the intermediate felt rolls 22, 32.
- the variable pressure means may take the form of apparatus for causing the roll, such as roll 24 or 34, to deflect relative to its axis in the desired direction.
- the roll 24 may be mounted on a'rigid supporting beam 40 having a pair of fixed, self-aligning bearings 41 mounted thereon and rotatably receiving the journals 42 protruding from each end of the roll 24.
- a movable bearings 43 At the outer ends of the journals 42 are movable bearings 43, which are also preferably of the self-aligning type, and which have depending therefrom the adjusting mechanisms 44.
- a bracket member is rigidly attached to each end of the beam 40 and protrudes outwardly therefrom to en'- gage the adjusting mechainsms 44.
- the movable bearings 43 may be moved in a direction normal to the axis of the roll 24. This will cause the journals 42 to pivot about the fixed bearings 41 and in turn, cause the center of the roll 24 to bow upwardly or downwardly, as indicated at 46 and 47 in FIG. 2.
- variable crown rolls 24 and 34 nonuniform felt tensions may be substantially alleviated, and a uniform moisture profile obtained in the paper web as it leaves the dryer section.
- a dryer section including a set of rotatable dryer drums, an endless felt trained about a portion of the peripheries of said drums to maintain a web being dried in said dryer section in contact with said drums a series of intermediate felt rolls positioned within the loop of said endless felt and adjacent said drums to maintain said ,felt adjacent said drums, and additional felt rolls for conveyingsaid felt from the last drum of said set to the first drum thereof, the improvement comprising:
- said means for varying the pressure with which at least one of said last named rolls contacts said felt along the length thereof comprises means for defleeting said roll with respect to the axis thereof.
- variable pressure roll is the last roll immediately upstream of said drying section.
- a dryer section comrpising: a. a plurality of rollers including:
- journal means protruding longitudinally outwardly of said one of said rollers
- said one of said rollers comprises a felt roll.
- a dryer section comprising:
- bearing means mounted for movement in a direction normal to the longitudinal axes of said lead in rolls and rotatably engaging said lead in rolls outwardly of said journaling means for bowing said lead in rolls longitudinally thereof to correct uneven felt tension and provide a substantially uniform moisture profile in a cross machine direction in a web being dried in said dryer section.
- step of varying said pressure comprises:
Abstract
Description
Claims (13)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US16640071A | 1971-07-27 | 1971-07-27 |
Publications (1)
Publication Number | Publication Date |
---|---|
US3778908A true US3778908A (en) | 1973-12-18 |
Family
ID=22603145
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US00166400A Expired - Lifetime US3778908A (en) | 1971-07-27 | 1971-07-27 | Paper machine drying apparatus |
Country Status (1)
Country | Link |
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US (1) | US3778908A (en) |
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3878620A (en) * | 1972-07-17 | 1975-04-22 | Mount Hope Machinery Ltd | Method and apparatus for drying paper |
US4324820A (en) * | 1980-07-18 | 1982-04-13 | St. Regis Paper Company | Method and apparatus for coating a paper web |
DE4429859A1 (en) * | 1994-08-23 | 1996-02-29 | Voith Gmbh J M | Paper-making machine drying section preventing angular fibre lie |
US6260287B1 (en) * | 1997-08-08 | 2001-07-17 | Peter Walker | Wet web stability method and apparatus |
US20060194490A1 (en) * | 2004-10-27 | 2006-08-31 | Voith Paper Patent Gmbh | Temporary changes in the properties of papermachine clothing |
US20110023317A1 (en) * | 2009-07-31 | 2011-02-03 | Brackett Timothy J | Dryer felt tension indicator apparatus |
US9481777B2 (en) | 2012-03-30 | 2016-11-01 | The Procter & Gamble Company | Method of dewatering in a continuous high internal phase emulsion foam forming process |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1873949A (en) * | 1930-01-29 | 1932-08-30 | Harrison R Williams | Paper drying means |
US3161125A (en) * | 1961-02-15 | 1964-12-15 | Beloit Iron Works | Adjustable crown roll |
US3443295A (en) * | 1966-02-04 | 1969-05-13 | Beloit Corp | Table roll |
-
1971
- 1971-07-27 US US00166400A patent/US3778908A/en not_active Expired - Lifetime
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1873949A (en) * | 1930-01-29 | 1932-08-30 | Harrison R Williams | Paper drying means |
US3161125A (en) * | 1961-02-15 | 1964-12-15 | Beloit Iron Works | Adjustable crown roll |
US3443295A (en) * | 1966-02-04 | 1969-05-13 | Beloit Corp | Table roll |
Cited By (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3878620A (en) * | 1972-07-17 | 1975-04-22 | Mount Hope Machinery Ltd | Method and apparatus for drying paper |
US4324820A (en) * | 1980-07-18 | 1982-04-13 | St. Regis Paper Company | Method and apparatus for coating a paper web |
DE4429859A1 (en) * | 1994-08-23 | 1996-02-29 | Voith Gmbh J M | Paper-making machine drying section preventing angular fibre lie |
US6260287B1 (en) * | 1997-08-08 | 2001-07-17 | Peter Walker | Wet web stability method and apparatus |
US20060194490A1 (en) * | 2004-10-27 | 2006-08-31 | Voith Paper Patent Gmbh | Temporary changes in the properties of papermachine clothing |
US20110023317A1 (en) * | 2009-07-31 | 2011-02-03 | Brackett Timothy J | Dryer felt tension indicator apparatus |
US8353219B2 (en) * | 2009-07-31 | 2013-01-15 | Paperchine Inc | Dryer felt tension indicator apparatus |
US9481777B2 (en) | 2012-03-30 | 2016-11-01 | The Procter & Gamble Company | Method of dewatering in a continuous high internal phase emulsion foam forming process |
US9809693B2 (en) | 2012-03-30 | 2017-11-07 | The Procter & Gamble Company | Method of dewatering in a continuous high internal phase emulsion foam forming process |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
AS | Assignment |
Owner name: WALTER E. HELLER & COMPANY, INC., 101 PARK AVE., N Free format text: SECURITY INTEREST;ASSIGNOR:BLACK CLAWSON COMPANY, THE;REEL/FRAME:004250/0792 Effective date: 19840130 |
|
AS | Assignment |
Owner name: BLACK CLAWSON COMPANY THE Free format text: RELEASED BY SECURED PARTY;ASSIGNOR:HELLER FINANCIAL, INC. F/K/A/ WALTER E. HELLER & COMPANY INC.;REEL/FRAME:004628/0875 Effective date: 19861015 |
|
AS | Assignment |
Owner name: CHEMICAL BANK, AS AGENT Free format text: SECURITY INTEREST;ASSIGNORS:BLACK CLAWSON COMPANY, THE, AN OH CORP.;HYDROTILE MACHINERY COMPANY, ANIOWA CORPORATION;REEL/FRAME:004930/0102 Effective date: 19880601 |
|
AS | Assignment |
Owner name: BANK ONE, DAYTON, NATIONAL ASSOCIATION Free format text: SECURITY INTEREST;ASSIGNOR:CHEMICAL BANK;REEL/FRAME:005319/0279 Effective date: 19900208 |
|
AS | Assignment |
Owner name: HYDROTILE MACHINERY COMPANY (NOW KNOWN AS BC MANUF Free format text: RELEASED BY SECURED PARTY;ASSIGNORS:BANK ONE, DAYTON, NATIONAL ASSOCIATION;CENTRAL TRUST COMPANY, N.A.;DNC AMERICA BANKING CORPORATION;REEL/FRAME:006414/0133 Effective date: 19921116 Owner name: BLACK CLAWSON COMPANY, NEW YORK Free format text: RELEASED BY SECURED PARTY;ASSIGNORS:BANK ONE, DAYTON, NATIONAL ASSOCIATION;CENTRAL TRUST COMPANY, N.A.;DNC AMERICA BANKING CORPORATION;REEL/FRAME:006414/0133 Effective date: 19921116 |